Magnetic skyrmion lattices in heavy fermion superconductor UPt3
A. Knigavko, B. Rosenstein
Abstract
Topological analysis of nearly SO(3)spin symmetric Ginzburg--Landau theory, proposed for UPt3 by Machida et al, shows that there exists a new class of solutions carrying two units of magnetic flux: the magnetic skyrmion. These solutions do not have singular core like Abrikosov vortices and at low magnetic fields they become lighter for strongly type II superconductors. Magnetic skyrmions repel each other as 1/r at distances much larger then the magnetic penetration depth λ, forming a relatively robust triangular lattice. The magnetic induction near Hc1 is found to increase as (H-Hc1)2. This behavior agrees well with experiments.
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